DPSM-690 – Differential Pressure Switch Mechanical
The Wika DPSM-690 is a heavy-duty, mechanical differential pressure switch designed primarily as a safety cut-out device for refrigeration compressors. It protects the compressor from catastrophic mechanical failure due to lubrication failure. It does this by constantly measuring the pressure difference between the oil pump discharge line and the compressor crankcase.
- Operating Pressure : High Performance Range
- Application : Industrial & Mobile Systems
About this item
The Wika DPSM-690 is a highly reliable, mechanical differential pressure switch engineered primarily as a safety device for pressure-lubricated refrigeration compressors. Often branded under the Wika (Indfos) name, it protects equipment by monitoring the difference between the lubricating oil pressure (\(P_{1}\)) and the crankcase suction pressure (\(P_{2}\)). If this differential pressure (\(P_1 – P_2\)) fails to reach or falls below the designated set point during operation, the integrated control breaks the motor circuit to prevent oil-starvation damage.
| Parameter / Feature | Specification & Functionality |
|---|---|
| Sensing Element | 304 Stainless Steel Bellows (A4 variant) or Copper Alloy (A3 variant). |
| Setting Range | Adjustable from 0.3 to 4.5 Bar. |
| Switching Differential | Fixed at 0.2 Bar. |
| Max Working Pressure | Up to 22 Bar. |
| Electrical Contact | 1x SPDT (Single Pole Double Throw) micro switch. |
| Process Connection | 3/8″ BSP Male threaded entry. |
| Enclosure Rating | Powder-painted mild steel with IP30 to IP33 rating. |
| Time Delay Relay | Built-in 60-second thermal delay to allow oil pressure buildup during startup. |
| Reset Mechanism | Manual reset knob to prevent automatic compressor cycling after a trip. |
| Primary Application | Safety protection against oil starvation in refrigeration compressors. |
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